can someone tell me what compression
30 thousand off is
35
40
45
50
55

I dont have the #'s and im too lazy to grad my calcuator...

Or better yet what does it take to get a stock head to 11-1?

Im in a situation where id like to not have to fly cut the pistons, since it isnt cheap to pull the motor apart.
I have 2.08 1.60 valves with a 226 234 55x 57x cam
id like to go bigger on the intake and smaller on the exhaust... i see a lot of guys with 228 224's and such but i dont know what compression they are running and if they had to clearence anything

 

Here is a quick rule of thumb.

30 off and bigger valves knocks your compression chamber CC to ~63.

For every 10 more off, it equates to about 1 CC.

Here are some compressions for stock bore stroke and a .052 gasket.

30 off = 10.9:1
40 off = 11.0:1
50 off = 11.2:1
55 off = 11.3:1